Another issue in discussing DV relative to CV teleportation is the classical teleportation fidelity of both systems. That is, the fidelity that can be achieved by purely classical information being communicated across the channel (e.g. the classical information representing the outcome of a particular quantum measurement). This classical information allows the receiver to partially reconstruct the desired quantum state. In the coherent state teleportation discussed earlier this classical fidelity was 1/2. However, for DV qubits it is 2/3. This fact translates into a less useful range of teleportation fidelity for the DV scenario relative to the CV scenario. Finally, it is worth noting that the Bell state measurements used currently in DV systems are only 50\(\%\)  efficient. This is a consequence of the fact that Bell state measurements based on linear optics can only discriminate between two of the four Bell states. Although, in principal, full Bell state measurements in the DV basis are possible (eg via ancilla and two-qubit interactions), no real-world implementation of the latter exist - all current deployments utilize a linear-optics-only solution [1]}, [2]}, [3]}.
